Acetate fiber physical properties

Basic Lead Acetate. Basic lead acetate [1335-32-6] (lead subacetate), 2Pb(0H)2-Pb(C2H3 02 )2, is a heavy white powder which is used for sugar analyses. Some physical properties are given in Table 4. Reagent grade is available in 11.3-kg cartons and in 45- and 147-kg fiber dmms. 

Meldrum s acid chemistry, 21 151,152, 153 Melengesterol acetate (MGA), 10 871 Melissic acid, physical properties, 5 30t Melt behavior, of polycarbonates, 19 805 Meltblown fabrics, 17 478-479, 495 Meltblown fibers, 11 237, 240-241 Melt casting, 14 230 Melt crystallization, 3 137—141... 

Typical chemical and physical properties of these fibers have been discussed (68). In slightly acidic or basic conditions at room temperature, acetate and triacetate fibers are very resistant to chlorine bleach at the concentrations normally encountered in laundering (68). Acetate and triacetate fibers are not affected by the dry-cleaning solutions normally used in the United States and Canada, but triacetate is softened by trichloroethylene (68). Delustering can be accomplished by hot soap solutions (72) so caution needs to be applied during cleaning of acetate fabrics. The immediate cause of delustering by hot soap solutions is the... 

Meiny different supports have been used to prepare ILMs Including cellulose acetate reverse osmosis membranes (1 6, 25, 29, ), micro-porous polypropylene ultrafiltration membranes (31-3 T7 polyvinyl chloride filters (35), and hollow fiber cellulose acetate reverse osmosis membranes T36). Way et al. ( ) discuss the chemical and physical properties that must be considered when an ILM support Is selected. 

The physical property of the cellulose sheet that relates mostly to the shreddability of the sheet is the sheet density. The lower the density, the easier the sheet is to shred or open up. Opening up the sheet to enhance the diffusion of chemical reagents into the bundles of cellulose fibers is of utmost importance. The purer the pulp and the lower the density, the softer the sheet generally. Sheet densities for acetate grades usually range from about 0.43 to 0.55 g/cm based on bone-dry cellulose. 

The AMPSA-doped polyaniline fiber that was exposed 17 s in ethyl acetate coagulation bath (Table 2.7) was subsequently exposed to steam at 20 psi for 2 h to dedope the fiber and was then reprotonated by soaking the dedoped fiber in 10 wt% methanesulfonic acid in methanol for 19 h. The methanesulfonic acid was dissolved in methanol instead of water, as this improves the tensile properties of the redoped fibers. The physical properties of these fibers (Table 2.8) are important in that they show that the steam-dedoped sample is the strongest PANI fiber made in our laboratory to date, in terms of tensile strength and modulus. 

A number of derivatives of cellulose are used commercially. Most of these are compounds in which two or three of the free hydroxyl groups of each glucose unit have been converted to an ester or an ether. This conversion substantially alters the physical properties of the material, making it more soluble in organic solvents and allowing it to be made into fibers and films. Treating cellulose with acetic anhydride produces the triacetate known as Arnel or acetate, used widely in the textile industry. Cellulose trinitrate, also called gun cotton or nitrocellulose, is used in explosives. 

W.L. Chou, M.C. Yang, Effect of take-up speed on physical properties and permeation performance of cellulose acetate hollow fibers. Journal of Membrane Science, 250 (2005) 259-267. 

Poly(acrylic acid), 260, 265, 278, 381 Poly(acrylic acid-alt-MA), 381, 382, 660 applications, 453, 660 physical and chemical properties, 442 Poly(acrylic acid-co-MA), 278 Poly(acrylic acid-co-maleic acid), applications, 278 Polyacrylonitrile, 444, 445 MA stabilization, 277 MA treated fibers, 505 poly(vinyl acetate-alt-MA) solutions, 441 Poly(acrylonitrile-co-butadiene), MA-grafted, 469 Poly(acrylonitrile-co-MA), 277 Poly(alkyl acrylates), poly(styrene-alt-MA) grafted, 474... 

Although the chemical structures of plant and bacterial cellulose are identical, the physical stmcture of bacterial cellulose is unique, being composed of ultrafine fibers that form an ultrafine network. The mechanical properties of bacterial cellulose are also unique. In this chapter, the mechanism of acetic acid bacteria cellulose biosynthesis, and its biological functions, properties, and industrial applications, are described. 

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